Mechanical movement for bicycles.



No. 650,343. Patented May 22, I900.

H. TUTTLE.

MECHANICAL MOVEMENT FDR BICYCLES. I

(Application filed Aug. 18, 1897.)

(No Model.) 2 Sheets8heet I.

WITNESSES I INVENTOR My? 54/ floanwv Tait 6e Mow [72414607 Atlormy No. 650,343. Patented May 22, I900.

H. TUTTLE. MECHANICAL MOVEMENT FOB BICYCLESQ (Application filed Aug. 18, 1897.) No Model.) 2 Sheets-Sheet 2.

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llOSMER TUTTLE, or CEDAR RAPIDS, IOWA, ASSIGNOR or ONE-HALF TO SHELLEY TUTTLE, or SALT LAKE crrr, UTAH.

MECHANICAL MOVEMENT FOR BICYCLES.

SPECIFICATION forming part of Letters Patent No. 650,343,- dated May 22, 1900.

Application filed August 18, 1897. Serial No. 648,722. (No model.) Y

- cation, reference being had therein to the accompanying drawings.

My invention relates to mechanical movements intended mainly for the propulsion of bicycles to take the place of the chain now generally used on safety-bicycles nnd thereby reduce the expense and the amount of friction. Although the construction of the movement can be used in connection with other machines, it is shown in the drawings in connection with a bicycle the frame of which may be of any suitable form. It comprises cranks and crank-pins on the axle of the hind wheel, sprocket-wheels on the axle of the pedal-shaft, and forked connectingrods to unite said axles, as described in Patent No. 564,665, granted to me July 28, 1896; but in this improvement the location of the hind cranks is within the side frames, the interlocking sprockets and the engaging or hooked ends of the forked connecting-rods are provided with antifriction-rollers, and special guides are provided for said connecting-rods in place of suspension-links. The constructionis shown in the accompanying drawings, in which Figure 1 represents a side view of a bicycle provided with a mechanism constructed in accordance with my-invention, but showing only one of the forked rods. Fig. 2 represents, on a larger scale, a top View, partly in section, of the mechanism. .Fig. 3 represents a side View of the same with the pedals and a portion of the horizontal frame and the upper frame removed. Fig. 4 represents, in top view and partly in section, the reanwheel axle, its ball-bearings, crank-shaft, and connectingrods. Fig. 5 is a side view of the rear portion of one of the forked connecting-rods, its crank-pin, ball-bearing cone, and locking device for said cone. Fig. 6 is a perspective view of the crank-pin. Fig.7 is atransverse vertical section of one of the forked connecting-rods and its oscillatory and longitudinallyreciprocatingball-bearing support. Fig.

8 is a side view of the same. Fig; 9 isalongitudinal vertical section of the cross-head guide. Fig. 10 is a side view of a modified form of sprocket-wheel for engagement with the arms of the forked connecting-rods. Fig. 11 is an edge view of said sprocket-wheel. Fig. 12 is a top view of one of the branches of the forked connecting-rod adapted for engagement with said sprocket-wheel. Fig. 13 is a side view of the same. Fig. 14 is a side view of another branch of the forked connecting-rods provided with a curved and divergent removable tip for engagement with sprocket-wheels of larger diameter for greater speed.

In said drawings, A represents the seat-carryingstandard of theframe, and A thebraces between the crank-shaft 12, carrying the pedals B and also the sprocket-wheels C and G and the crank-axle d for the hind wheel E, said axle 01 having its ends received in ballbearings a*, mounted in the rear ends of the braces A and protected by caps (1 which serve also as a lock-nut for the hallway.

Each end of the axle d has a crank-arm d and each end of the hub of the wheel E has a similar cran k-arm e but the arms e are set at an angle of ninety degrees to each other. The arms d e of each crank are united together by a tubular crank-pin D, having lugs provided with parallel side faces and projecting from its ends that are received in corresponding cavities formed in the arms 01 c and a bolt D passing through said arms and through the crank-pin D, secures these parts together until it is desired to remove the wheel E for repairs. The pin D is grooved circumferentially to obtain a ballway to receive the inner face of the balls of the ballbearing around it, and said balls are inclosed .by the rear end of each forked connectingrod, being adj ustably retained in their seat by a ball-cone D having its periphery provided with serrations. To lock said cone, a dog d is secured with a screw to the outer face of each connecting-rod and has its acute end made to engage with some one of the serra tions on the periphery of the flange of the cone D The sprocket-wheel C has projecting from its periphery at equal distances apart three teeth a, provided on their end with antifriction-rollers r, to be received alternately into sprocket receivers or pockets f, placed on the front end of the lower branch of a forked connecting-rod F. A similar but inverted pocket f is placed on the front end of the upper braneh of the forked connecting-rod F to interlock with one of the antifriction-roller's 0. It is evident that the arrangement of the interlocking parts can be inversed and that the sprocket-wheel can be provided with pockets 0 in its periphery, as shown in Figs. and 11, and the outer end of each branch of the forked connecting-rod be provided with an antifriction-roller r, as shown in Figs, 12, 13, and 14:, to interlock with said pocket withont departing from the spirit of my invention.-

The distance between the front ends of the branches of the forked rod F is slightly were,- but about equal to the diameter of the wheel 0, withthe addition of one ofits spreclietsor antifriction-rollers. Said distance is main; tained by a vertical brace Ffinniting said branches, and divergent b'r'aees F',uniting the pocketed ends to said brace F The front ortion of the connecting rod F may be sue pended from the standard A by means era the side braces A- of the fraine.

' the opening in said brace F one ball in each pocket.

link F, as shown by dotted lines in 1, having its lower end pivoted to the vertieal brace F and its upper end pivoted upon a short shaft secured to the standard A; hut other means are shown in full lines in Figs. 1, 2, 3, 7, 8, and 9, and are mounted iipen I Said means consist of a gui de=plate H, brazed or ether; wise secured along the inner face of brace A and a cross-head I, centrally pro: vided with a pin 1', having its periphery screw threaded and made to pass throughthe ven tical brace F of the forked rod. Bantamings' are interposed between the pin t'a-nd Belts-ear ings; afe'al'so interposed between the cross-head I and the guide-plate H, the latter being previded with two ballway-pocket-s h in the top and also in the bottom and preferably only The rooved crosshead I is also provided with grooved ball- Ways adjustably retained by screws passing through the top and bottom thereof and have their ends closed by small plates 1', seen-red to the ends of said cross he'ad. p

The above description relates to the lefthand half of the driving mechanism; lint the mechanism on the right-hand side is exactly similar and consists of the forked connectingrod G, having the brace G carriedby crosshead and guide-plate, as above desribed.

'The lower branch of the connecting-rod G has a pocket g andthe upper branch an invet-ted pocket g*. The sprocket-wheel O is provided with three sprocket-s 0 provided with antifriction-rollers and equally spaced apart, but so timed relatively to the sprockets c of the wheel Q as to be about thirty degrees in the rear of each one of them.

The frame of the machine is provided with a forward brace A as usual.

In the operation of the mechanism the rocking up and down of the rear end of the connecting-red F or G causes an inverse motion of the front end of said rod. In other words, when the left-hand crank-pin D on the rear end begins to ascend and passes above a horizontal line passing through the enter of the rear shaft its front end descends and itspocket f reeeive's into engagement one of the uppermost sprocket-teeth, and said sprocket-tooth in its revolution pulls upon the rod F and continues to revolve the rear axle cl. When the crank-pin D descends below the center 6f the crankshaft d, the front end of the red F as 'ndsahd its pecket freceives int-e the entrant ti that teeth of the wheel 0; and said spree 6th pushes theconseeting-rod F rearwa'rdly and continiies to revolve the rear axle (1.

As there 'rniist ne'ee's's'arily be some moments in which the peeli t's of the red F are not inengagement with the antifr'ictionrelief of eith a 6 5 or a Bette-m sprecket teeth, the dd 1611 at the mechanism is retjh-ired to aetu t 6 rear crank-axle during' these inter ediate movements, The sproeket t'eeth are "*referaniy niade to projeet slightly (in d' "'ide (if the sprocketwheel, so that the bedy of the latter will not be the way 6f the hooked ends of the connecting-reds, and said teeth can be made shorter; As tnereis' only oneteot-h or at the most a pert-ion two teeth in engagement with the ecii eetin jreds and said teeth are provided Withantif then-tenses, the frictien is reduced to the ininiihdiii possible,

The diameter of the sprocket-wheels and the number of teeth they a're to carry canbe seleeted according to the speed of motien that ma he desired,

Having now fnlly' described my invention, I claim 7 In a mechanical niov'e'ment for bicycles, the combination of the axle of one or the ins-wheels, t'we drank-pins carried by said a-x'le, two bianehed coiinecting=reds having at one end two oppositely-disposed sprocketreceiver's, spr'ecket-wheels having teeth for engagement with the branched cennectingwas, a brace uniting the branches of'said rods,-

guide-madam a cross=head embracing said plate and having a pin revolubly connected with the branched eonneetiugrod snbstantially as deseribed.

In testimony whereof I affix my signature in presence of two wit'rresses;

HOSMER- TUTTLE. 

